GHSA-QMJ7-FH92-4787
Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-28 09:31In the Linux kernel, the following vulnerability has been resolved:
xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()
Fix the race by pruning the bin while still holding xfrm_policy_lock, before dropping it. Use __xfrm_policy_inexact_prune_bin() directly since the lock is already held. The wrapper xfrm_policy_inexact_prune_bin() becomes unused and is removed.
Race:
CPU0 (XFRM_MSG_DELPOLICY) CPU1 (XFRM_MSG_NEWSPDINFO) ========================== ========================== xfrm_policy_bysel_ctx(): spin_lock_bh(xfrm_policy_lock) bin = xfrm_policy_inexact_lookup() __xfrm_policy_unlink(pol) spin_unlock_bh(xfrm_policy_lock) xfrm_policy_kill(ret) // wide window, lock not held xfrm_hash_rebuild(): spin_lock_bh(xfrm_policy_lock) __xfrm_policy_inexact_flush(): kfree_rcu(bin) // bin freed spin_unlock_bh(xfrm_policy_lock) xfrm_policy_inexact_prune_bin(bin) // UAF: bin is freed
{
"affected": [],
"aliases": [
"CVE-2026-53239"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-25T09:16:41Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()\n\nFix the race by pruning the bin while still holding xfrm_policy_lock,\nbefore dropping it. Use __xfrm_policy_inexact_prune_bin() directly since\nthe lock is already held. The wrapper xfrm_policy_inexact_prune_bin()\nbecomes unused and is removed.\n\nRace:\n\n CPU0 (XFRM_MSG_DELPOLICY) CPU1 (XFRM_MSG_NEWSPDINFO)\n ========================== ==========================\n xfrm_policy_bysel_ctx():\n spin_lock_bh(xfrm_policy_lock)\n bin = xfrm_policy_inexact_lookup()\n __xfrm_policy_unlink(pol)\n spin_unlock_bh(xfrm_policy_lock)\n xfrm_policy_kill(ret)\n // wide window, lock not held\n xfrm_hash_rebuild():\n spin_lock_bh(xfrm_policy_lock)\n __xfrm_policy_inexact_flush():\n kfree_rcu(bin) // bin freed\n spin_unlock_bh(xfrm_policy_lock)\n xfrm_policy_inexact_prune_bin(bin)\n // UAF: bin is freed",
"id": "GHSA-qmj7-fh92-4787",
"modified": "2026-06-28T09:31:46Z",
"published": "2026-06-25T09:31:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53239"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/25c8c7fb3b0b9668c7d05e209f58c158d2b020c7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/42827d03f8009a6a218bacab153e21f39d6a121c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7f2d76c9c03257c0782afef9d95321fa04096f60"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/88697cf980222d5906a37bf47662dac0732e2a0f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8fc536e9f6856230f19c7d13e71af064b6a77b22"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b5316e2b8614a87d8736941972441cb47bfd4491"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c4c1ea36d83bf3c4569468ca5b8b614fda1bf821"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ec82ea4eb220164d854f8734ca5a35e23e577b94"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
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